The teacher told us that everyone has an important role in protecting the earth from .
A. to play; to pollute
B. to be played; to be polluted
C. to play; being polluted
D. to be played; being polluted
网友回答
A. to play; to pollute
B. to be played; to be polluted
(答案→)C. to play; being polluted
D. to be played; being polluted
解析：考查不定式和固定搭配。本句中的不定式to play是用来形容名词role；第二看是固定搭配protect sb from doing sth阻止某人做某事；句意：老师告诉我们在阻止地球被污染的过程中，我们每个人都会起重要的作用。第一句中的不定式充当定语，修饰role；因为这个动作是句子主语所作，故使用主动的形式。根据句意说明第二空中使用动名词的被动形式。故C正确。